With around 250 days until the start of the 2012 Summer Olympics in London, this seems like a good opportunity for a quick preview of the venues that will be used for the 26 different sports. A number of new venues in the ‘Olympic Zone‘ are shown under construction in Google’s satellite imagery dating from June 2010. The new Olympic Stadium was completed earlier this year and has a capacity of around 80,000 spectators. After the Olympics and Paralympics are over it will be converted to a football stadium for use by West Ham United who won the…